Inside the U.S. Senate's gun control gridlock

/ AP

On Monday, the U.S. Senate voted on four gun measures following the mass shooting that killed 49 people at a gay nightclub in Orlando. Senators largely voted along party lines, rejecting each bill. Here's a look at how Monday's four Senate bills fell short of the required 60 votes to move forward.

On Monday, the U.S. Senate voted on four gun measures following the mass shooting that killed 49 people at a gay nightclub in Orlando. Senators largely voted along party lines, rejecting each bill. Here's a look at how Monday's four Senate bills fell short of the required 60 votes to move forward.

The Republican-backed plan proposed to boost the national background check system's resources and revamp the legal language that prohibits mentally ill people from buying a gun. Democrats said the plan doesn't do enough.

The Republican-backed plan proposed to boost the national background check system's resources and revamp the legal language that prohibits mentally ill people from buying a gun. Democrats said the plan doesn't do enough.